Split switching gear



Dec., m H929., C F. JENWS' 13405354 SPLIT4 SWITCHING GER Filed Sept. 6. 1928 Panarea nea ir, teas CHARLES FRANCS JENKNS, UF WASHENGTON, :DISTRICT 0F COLUMBIA, ASSIEGNOB; T0

JENKNS LAIBURLLTRIES, 0F WASHNGTON, DISTRICT 0F TION 0F THE D lSTRlVCTpF COLUMBIA SPLET SWTCHmG GEAR .application filed September lhis invention relates to radiovision receivers, particularly to switching gear therefor, which permits a simplicity of apparatus not otherwise possible. l

lit is designed as' an essential in the practice of the art-in' the manner shown in copending case No. 242,989. 1

rlihe main Objectis to simplify the switch` ing mechanism, and at the same-time deliver maximum current lto all-'lamps in succession Without any currentby-pass through other lampsr With these and other objects in view the invention consists inthe novel combination lot' elements herein described-'and illustrated and particularly pointed out'in the claims.

ln the drawings, Figure l is a front view ot a multiple 'lamp trarne; lligure 2, an edge view thereof; -liligure 3 a detail of one 'of the lamps, shown .here as a luminescent lamp, thoughv suitable filament lamps may be used;

. and Figures 11i-and 5 a schematic drawing ot they switching gear employed to light the f lamps singly and fina given sequence.

ln the iguremlt is a lamp frame;` 'B and B are lamps; Eis aground glass screen which may or mayn'ot be used in front of thelamps; F is the cathode glow-targetsof the lamps (Fig. 3). and H a condenser. K is'a stationary multiple brush commutator having a moving segment or contacting member L, fastened to arm M, sweeping over the lflexible brush ends N. Q is a ti-segment commutator, with its brush R, mounted on arm S For purpose s of easier illustration, assume the 'frame A to contain 2304c lamps, divided into six banks of 384 lamps each.l rlhere are six circular rows of stationary brushes N (ltig. 5), and correspondingly six electrically independent moveable contacts L. on six electrically connected arms M (Fig. 4). Each of these contact armsis electrically connected to its respective collector ring, as at Y and Y, Fig. 5.# A

The commutator @has six stationarysegHV ments, one segment for one oteach. of the sin rows of brush contact arms of commutator K, and therethrough to the six banks of-lamps. That is, for the 2304 lamps, each G is a resistance in the lamp leads,

6, 1928. Serial No. 304,354.

row of contact segments of the commutator K needs have only 384 brushes, and the commutator K .may be small, for it rotates sin times to light vthe entire 2301i lamps. As it sweeps over the 384i brushes, only a single lamp is lighted, because the 384 lamps of a single bank are in circuit only through the second commutator Q.

When commutator K makes its `second revolution it lights the lamps oneV at a time in the second'banlr of lamps, because commu-v 4tator Q, has moved-its brush onto the second segment, which feeds current` into the second row of segments of commutator K.

Continued rotation of both commutators will eventually light all of the lamps.

` As the Afunctioning of the other elements shown in the drawing is described in co-pending case No. 242,989, and the same is not essential in -a complete understanding of this invention, perhaps no description here is needed.

The particular 'advantage of this invention is that a commutatorof but a few inches in diameter is just as satisfactory as a commutator siX times as'large of consequent heavy Vand clumsy structure.

at l claim, is-

l. ln' combination a banlr of current trans- ,l/ating devices arranged in coordinate rows, andV means for connectinge'ach device successively in circuit comprising a group com mutator "having a groupy contact for each row of said devices, another commutator having a contact for each oitD said devices, the contacts in said other commutator being arranged in tiers, a movable brush for each of said tiers,and means for connecting said brushes to the contacts of the rst commu? tator. l

2. ln combination a lamp bank comprising a plurality of television reproducing lamps arranged in coordinate rows, a iirst commutator having a group contact for each row COLUMBIA, .Et CORPORA- titi of lamps, another commutator-having a contact tor each lamp, said ccntactsbeing arranged in tiers, a brush assembly for said tires of cntacts, and aslin ring device carried by said brush assembly for connecting said tiers to Jche contacs of the first commutator.

3. n a television system-means for conmeeting the lamps of a reproducing lamp bank successively in circuit, comprising a group connnutator having ixed .contactsL each corresponding to a row of lamps, and a11other'-eommutator having the contacts arranged in lciers, and means fol-connecting the fixed contacts of the first (zorlflrrruzriiorv to th brushes' of the second commut'ator.

in testimony whereof I have affixed my signature.

CHARLES renners JENKINS. Y 

